New Wrenches

[steffan]

I was cleaning out dad's garage and found these - never seen anything like them. I'm waiting to find a rounded/ difficult bolt to try them out.

 

[John McVicker]

Not 100% sure, but I don't believe those are for stubborn bolts.

Instead , I think they are meant to be able to get another bite on the bolt to turn it, without lifting the wrench off the bolt. Sort of a ratchet movement.

John

 

[fhawk5]

That is a smart design.. The nut has the pressure exerted mid-point, where it should be..

 

[Rifleman]

Snap on were the first ones to offer a wrench like this, they were called flank drive. As John pointed out they are kind of a speed wrench. You turn the bolt and without removing the wrench from the bolt flats you just lift up on the end of the wrench and it just slips over to the next flat on the bolt head. They are great to work with in tight spaces. Here's a link to a set of craftsmen that do the same thing http://www.usedcarssearch.net/detai...-Speed-Wrenches-Set-Of-6-58_201283650820.html

 

[steffan]

Thanks for the replies but I don't think it's a speed wrench: the tolerances are very tight and you have to have wrench on almost perfectly square or it won't go over the nut and then there's no wiggle or ratchet to be had. I'm still thinking its for worn or extreme torq applications but I still haven't had the opportunity to really try it out

 

[steffan]

Just googled the patent - interesting stuff, should have done it earlier. It's designed to load the fastener so it doesn't slip:
Aug. 3, 1954 F DIEBOLD v 2,685,219 OPEN-END WRENCH JAWS HAVING THRUST AND PULL SURFACES OF DIFFERENT CURVATURE Filed March 25, 1953 i w s 7; \!Q- s I l/ INVENTOE Frifiz Diebold.

 

[maxamillion2345]

Look like New Britain? Great wrenches if so.